instance method beginAnimations:context: not found

Question

i am trying to add animation to move my buttons from left to right.

i have added the following code

[self.view beginAnimations:nil context:nil];
[self.view setAnimationDuration:1.0f];
[button setFrame:newFrame];
[self.view commitAnimations];

but when i build, i see the warning "instance method beginAnimations:context: not found"

I have added QuartzCore framework and included

#import <QuartzCore/CoreAnimation.h>

Can someone please tell what am i missing?

Thank you

Answer 1

Importing quartz headers is not necessary.

beginAnimations:context: is a class method. You are calling it on an instance of UIView. The same applies for setAnimationDuration and commitAnimations . Replace self.view with UIView or, better, use block-based animations instead.

Your code, corrected:

[UIView beginAnimations:nil context:nil]; 
[UIView setAnimationDuration:1.0f]; 
[button setFrame:newFrame]; 
[UIView commitAnimations]; 

Block-based (iOS4.0 and later):

[UIView animateWithDuration:1.0 animations:^{[button setFrame:newFrame];}];

Based on your comments, you are missing my point. These methods are class methods. you need to call them directly to UIView - the class . Not to self.view , which is an instance of UIView . Look at the line of code above - the message is being sent to UIView . Use the exact line of code above. Copy and paste if you like. I'm not using UIView as a placeholder for "insert a view object here!", it's the code you have to use.